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Tag Archives: Air Quality

Green House Gases: Reduce it to earn Carbon Credits


Clean Development Mechanism, earn you Carbon Credits. It also helps reduce the pollution which is an invisible killer. And no, the earth dust & wood smoke we all see in films on African & Indian documentaries don’t kill. The killer gases are slick city dwellers.

Having said that, let us understand what is “pollution” to appreciate the immediate and urgent need for each one of us to act to reduce it in every sphere of our life-style.

Pollution is the introduction of contaminants into a natural environment that causes instability, disorder, harm or discomfort to the ecosystem i.e. physical systems or living organisms. Pollution became a popular issue after World War II, due to radioactive fallout from atomic warfare and testing.Till then a non-nuclear event, “The Great Smog” of 1952 in London, killed at least 4000 people. (which is a very small number in todays unprecedented and urgent situation, hurtling headlong towards us and expected to hit by 2017, as per the SREX report.)

Pollution control is a term used in environmental management. In the hierarchy of controls, pollution prevention and waste minimization are more desirable than pollution control. In the field of land development, low impact development is a similar technique for the prevention of urban run-off.

Let us examine in brief the top 5 GHG : 1.CO2 :Carbon Dioxide. 2.CH4 :Methane. 3. N2O: Nitrous Oxide. 4. O3: Ozone 5. SP: Suspended Particles . A detailed report of the effects of these can be found in the internet, should one chooses to read. The chart shows how much GHG is emitted sector wise. However I think SO2F2: Sulfuryl Fluoride should also be included in the top 5 as its more harmful than CO2.

Now there are also Naturally occurring greenhouse gases. They include water vapour, carbon dioxide (CO2), methane (CH4), nitrous oxide (N2O), and ozone (O3). Several classes of halogenated substances that contain fluorine, chlorine, or bromine are also greenhouse gases, but they are, for the most part, solely a product of industrial activities. Chlorofluorocarbons (CFCs) and hydrochlorofluorocarbons (HCFCs) are halocarbons that contain chlorine, while halocarbons that contain bromine are referred toas bromofluorocarbons (i.e., halons). Some other fluorine containing halogenated substances—hydrofluorocarbons (HFCs), perfluorocarbons (PFCs), and sulfur hexafluoride (SF6)—do not deplete stratospheric ozone but are potent greenhouse gases.There are also several gases that, although they do not have a commonly agreed upon direct radiative forcing effect, do influence the global radiation budget. These tropospheric gases— referred to as ambient air pollutants—include carbon monoxide (CO), nitrogen dioxide (NO2), sulfur dioxide (SO2), and tropospheric (ground level) ozone (O3). Tropospheric ozone is formed by two precursor pollutants, volatile organic compounds (VOCs) and nitrogen oxides (NOx) in the presence of ultraviolet light (sunlight). Aerosols—extremely small particles or liquid droplets—often composed of sulfur compounds, carbonaceous combustion products, crustal materials and other human induced pollutants— can affect the absorptive characteristics of the atmosphere.

We live in and work in buildings which use various types of building materials most of them are cause of Environmental degradation which the average person is not aware of.  About 40% of the Global Green House Gas (GHG) is emitted through building related activities and 60% of this pollution occur post occupancy in form of municipal waste etcetera to indirect pollution via consumption of electricity, which generally coming from Thermal Power plants which burn coal & is high on emission of pollution .

There is an immediate and urgent need to reduce this pollution to keep our health and comfort to the optimum. To do this we must design Energy Efficient Buildings (EEB) which is low on pollution. Let us see what are the types of material we use in buildings.

 If we just take one example SF6;Now other than SF6 being 4,800 times worse than CO2 in the global warming scale, Sulfur fluoride is a gas fumigate that has been used — since the 1950s — to kill bugs and rodents in indoor structures, such as homes, warehouses, and railroad cars. It is also used in the Electricity sector, the magnesium industry, the electronic industry even as an adiabatic property applications, notably in tennis balls, shoe soles and other applications, such gas-air tracer in research and leak detectors, for medical purposes, electronic applications, sound proof windows ( Double Glazed), de-gassing aluminum specialties etc.

 If we look more closely at global industrial emissions of CO2, CH4, N2O, and the ‘new’ gases HFCs, PFCs and SF6, then it shows that about half of them stem from CO2 emissions related to cement – clinker – production, ( a major product required for the building industry) about one-fifth can be attributed to adipic   acid (CH2)4(COOH)2  and nitric acid production and one-third stem from the three new gases, each with approximately equal contribution of about 10%.

The building industry is perhaps the biggest consumer of all that is produced in all other industrial sector, be it steel, cement, stone, wood, leather, paper, paint, ceramic, glass, plastic, electrical & electronics; think of a product either in finished good or raw material, the building industry more often than not has a use for it. Thus emitting some form of pollution in the process.

Purely from a Building Industry perspective without Sustainable Building design practice however high we build, we will fall prey to the catastrophe the GHG will bring in its wake in form of Global Warming & Climate Change.

 To do this we need to develop life-style which is sustainable. Act without weighing the “additional cost factor” of going Green, which actually is very nominal and becomes Zero Sum within a very short time span. Internationally we have Green Building programs such as LEED, BREEAM and GRIHA which is the Indian National rating system. India also has a Confederation of Indian Industries driven – Indian Green Building Council which is doing spectacular work.

With the new Global Climate Fund (GCF) more or less operationalized to a decent sum this year at the UNFCCC  COP17 at Durban, South Africa. Reducing pollution would be a Bankable word.

Some of the references   has  been condensed for easy read and adapted from Source(s):Wikipedia, the free encyclopaedia; Observations of CAPIEL-UNIPEDE concerning the Revised IPCC Guidelines for National Greenhouse Gas Inventories ; IPCC ; the U.S. EPA’s Global Warming web; Fluoride Action Network and others.

 

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Technical Manual for Sustainable Site Documentation.


SUSTAINABLE SITE DESIGN:

The purpose of sustainable site planning is to integrate design and construction strategies by modifying both site and building to achieve greater human comfort and operational efficiencies. It charts appropriate patterns of use for a site while incorporating construction methods that minimize site disruption and the expenditure of financial and building resources. The process is based upon the premise that any landscape setting can be analyzed and studied as a series of interconnected geological, hydrological, topographic, ecological, climatological, and cultural features and systems. Selecting a building site begins the process of calculating the degree of resource use and the degree of disturbance of existing natural systems that will be required to support a building’s development.

SITE ANALYSIS AND ASSESSMENT:

Site assessment is a process that examines the data gathered and identified in the site analysis, assigns specific site factors to hierarchies of importance, and identifies, where possible, interactive relationships.

Data collection:

Technical site data –

Geographical latitude (solar altitude) and microclimate factors, such as wind loads

Affect building layout, including solar orientation and location of entrances, windows.

Topography and adjacent landforms—Influence building proportions, wind loads, drainage strategies, floor elevations, and key gravity-fed sewer-line corridors.

Groundwater and surface runoff characteristics— determine building locations as well as natural channels for diverting storm runoff and locations of runoff detention ponds

Solar access—Determines position of building to take maximum advantage of natural solar resources for passive solar heating, day lighting, and photo voltaic.

Ai r-movement patterns, both annual and diurnal— particularly influence sitting of multiple structures to avoid damming cold moisture-laden air, or blocking favorable cooling breezes during periods of overheating. Properly measured wind loads and pressure differentials are essential for designing interior air-handling systems or use of passive solar cooling strategies.

Soil texture and its load-bearing capacity—Determine building location on the site and the type of footing required. Identify site-grading processes by the soil’s potential for erosion by wind, water, and machine disturbance.

Parcel shape and access—Affect a site’s capacity to accommodate a proposed development, even if its size and environmental\ factors are favorable. Potential access points should not burden lower-density or less compatible adjacent land use. Zoning setbacks and easements can also affect development potential.

 Neighboring developments and proposed future developments—Affect proposed project and may lead to requisite design changes.

Analyze specific characteristics of climate zones: Climate has specific characteristics requiring mitigation, augmentation, and exploitation; there are 5 climatic zones in India.

Analyze the site’s existing air quality: Most state require an environmental impact assessment (EIA) outlining the potential negative impacts of a proposed development and how they might be alleviated. Site planning requires two kinds of air-quality analysis regarding: (1) assessment of the existing air quality of the site to determine the presence of noxious chemicals and suspended particulates, and (2) projection of the negative consequences (if any) of the proposed development on existing air quality. In primarily commercial or industrial areas, poor air quality should be a key factor in determining site suitability and use, especially for such facilities as schools, parks, or housing for seniors. Testing should anticipate seasonal or diurnal wind patterns to make certain that the worst possible case is tested.

Perform soil and groundwater testing: Perform soil tests to identify the presence of chemical residues from past agricultural activities (arsenic, pesticides, and lead); past industrial activities (dumps, heavy metals, carcinogenic compounds and minerals, and hydrocarbons); and any other possible contamination either on or in the vicinity of the subject site.

Test soil suitability for backfills, slope structures, infiltration: The native soil should be tested to determine bearing, compactability, and infiltration rates, and, in turn, structural suitability and the best method for mechanical compaction (i.e., clay soils require non-vibrating compaction and non-erosive angles of repose for cut-and-fill slopes).

Evaluate site ecosystem for existence of wetlands and endangered species: Preservation and restoration strategies require thorough economic analysis, specialized expertise, and sound baseline data gathered through both remote and on-site sensing methods.

Examine existing vegetation to inventory significant plant populations: This will enable the developer or owner to later specify vegetation that is susceptible to damage during construction, so that protective measures can be developed and implemented.

Map all natural hazard potentials (such as winds, floods, and mudslides):Eberhard Bosslet - Since 1983 - works with rui... Historic flood data, wind-damage data, and subsidence data should be mapped along with current annual wind and precipitation data.

Diagram existing pedestrian and vehicular movement and parking to identify Patterns: Existing traffic and parking patterns in areas which are adjacent to or near the site may need consideration in relation to proposed building design and site circulation patterns.

Review the potential of utilizing existing local transportation resources: Explore the sharing of existing transportation facilities and other resources, such as parking and shuttles, with existing institutions. This can lead to greater site efficiencies.

Identify construction restraints and requirements: Special construction methods may be required because of local soil condition, geology, earth-moving constraints, and other site-specific factors and constraints.

Infrastructural data

Analyze site for existing utility and transportation infrastructure and capacity: Existing infrastructure should be analyzed for integration into the building and facilities.

Historical Data

Review architectural style of the area for incorporation into building: If desirable, the architectural style that is historically predominant in an area can be reflected in the building and landscape design, enhancing community integration.

DATA ASSESSMENT  Illustration of a level spreader installation ...

Identify topographic and hydrological impacts of proposed design and building use: Measure cut-and-fill potential and assess potential for erosion, siltation, and groundwater pollution.

Develop general area takeoff and overall building footprint compatibility with site: For example, measure total site coverage of impermeable surfaces to determine thresholds of run-off pollution potential (i.e., over 20 percent impermeable coverage of gross site requires mitigation to clean storm water before it enters drainage system off-site). Footprint should also maximize site efficiencies with regard to required road, utility, and service access.

Identify alternative site design concepts to minimize resource costs and disruption: Develop several alternatives to explore optimal pattern with regard to factors such as grading and tree-clearing consequences and resulting infrastructure costs.

Review financial implications of site development, building, and projected maintenance costs: Total cost of the project must factor in ongoing costs associated with the site design, development, and operations, as well as hidden embodied energy costs associated with specific materials.

DeveloUS Air Quality Index Map-1/23/2009p matrix of use and site compatibility index: Each site may be assessed to reveal its development compatibility index with regard to a specific type of development. This index may reveal a pattern of incompatibilities thereby specific appropriate mitigation measures are undertaken.

Courtesy: Nicholas T. Dines, author.

 

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